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st: RE: RE: RE: RE: Resdesigning dyadic data formats


From   "Nick Cox" <n.j.cox@durham.ac.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: RE: RE: RE: RE: Resdesigning dyadic data formats
Date   Wed, 21 Apr 2004 14:43:34 +0100

This is set as an exercise to see if you understood
the lesson. Alternatively, an untested solution 
is at the end. 

Suggested reading: 

How to move step by: step. Stata Journal 2(1):86-102. 

(explains the use of the by varlist : construct to tackle
a variety of problems with group structure, ranging from
simple calculations for each of several groups to more
advanced manipulations that use the built-in _n and _N) 

Nick 
n.j.cox@durham.ac.uk 

> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu]On Behalf Of Neumayer,E
> Sent: 21 April 2004 14:24
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: RE: RE: Resdesigning dyadic data formats
> 
> 
> Nick, great! Now, one more complication. Your advice works if 
> there are dyads in just one year. But assume now that there 
> is also a year variable. OK, with "fillin c1 c2 year" I get 
> the dataset in a nice rectangular shape. What adjustment do I 
> need to make for the other four lines:
> 
> gen max = max(c1,c2) 
> gen min = min(c1,c2) 
> bysort max min (x) : assert _N == 2 
> by max min: replace x = x[1] if missing(x) 
> 

gen max = max(c1,c2) 
gen min = min(c1,c2) 
bysort max min (year x) : assert _N == 2 
by max min year: replace x = x[1] if missing(x) 

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